Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb3aba8f8d215d1…

MALICIOUS

PDF

80.7 KB Created: 2021-04-07 02:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a4be16b09dce7486f996c0c434d11c24 SHA-1: 943d88aaecab499115f76cbbfd5182e2de9feac9 SHA-256: 6cb3aba8f8d215d10ed923c88a63ae21f6c0aef916a36cbf2ca3744c4614b174
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/wix?keyword=anime+boxes+apk PDF link annotation
    • https://jigugelelatowo.weebly.com/uploads/1/3/1/4/131437208/bf522.pdfIn PDF document text
    • http://003-center.ru/kangertech_evod_vv_flashing_whitezp40i.pdfIn PDF document text
    • http://getchambre.xyz/harbor_freight_predator_3500_watt_inverter_generatorz27ax.pdfIn PDF document text
    • http://gasorutika.iblogger.org/university_of_alberta_campus_recreation.pdfIn PDF document text
    • https://dopakegufa.weebly.com/uploads/1/3/1/3/131384718/9d89a.pdfIn PDF document text
    • http://romeoplanet.club/37048741185aa6om.pdfIn PDF document text
    • https://wosiwimobej.weebly.com/uploads/1/3/1/1/131164223/kosaverarizudepabop.pdfIn PDF document text
    • http://istlan.fun/37615862436k0fvu.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/how_to_make_origami_stars_out_of_paperb734r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_5843647161b847149f435a8e694c62a4.pdf?index=trueIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_30aff3ed3f504bb3b445221834f59b55.pdf?index=trueIn PDF document text
    • http://buzuvemujogumob.epizy.com/are_landline_phones_being_phased_out.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/ethercat_installation_guidelines.pdfIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_d89a65f05b2447988030117a06ccb89b.pdf?index=trueIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_092212332db647898a70b100b494bec4.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_fe9d6c9d2ed94cfaa5fe99c702fc5400.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/android_tablet_with_pen_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/kms_activator_office_2010_gratis.pdfIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_11ecd29170ff41cea3988fdb863e8052.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/kufewuno.pdfIn PDF document text
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_49a2b863ad3a4824b667cd53980c06ca.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B2 5096 bytes
SHA-256: da73c197e6f13dda355122a9d1ea4bdc9b7675f4a9bf2072fcfefb6a75822215
font_01_sfnt_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 10776 bytes
SHA-256: c98921898cf7c1fb648d7ae562b7082983a4933b59156e31cf1c66023efdc4cb
font_02_sfnt_off00011e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5C 16244 bytes
SHA-256: 304e2f57f545ba2d6f326a687d1babe540e5f8ad961c4d624be9a686aeaf56cb